How many of you are recording their historical project-data - for future estimates and how are you doing it?

Question

When working on a project - I always estimate my tasks and calculate how long it will take me to finish. So in the end I get a time-span in which the project should be finished (it rarely is).

My question is - do you record your data and assumptions use in your estimates during a project and use them for later projects or refined estimates on the same project?

If so - how do you record such data and how do you store them?

I used an excel-sheet - but somehow (cannot imagine how that happened ;)) I tend to forget to fill in new assumptions or gained information. On the other hand it is not really readable or useful for evaluating my predictions after finishing the project - to learn from it for the next project.

Answer 1

Sounds like what Joel wrote FogBugz for.